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Contents
module RSpec
module Matchers
module BuiltIn
# @api private
# Provides the implementation for `equal`.
# Not intended to be instantiated directly.
class Equal < BaseMatcher
# @api private
# @return [String]
def failure_message
if expected_is_a_literal_singleton?
simple_failure_message
else
detailed_failure_message
end
end
# @api private
# @return [String]
def failure_message_when_negated
<<-MESSAGE
expected not #{inspect_object(actual)}
got #{inspect_object(expected)}
Compared using equal?, which compares object identity.
MESSAGE
end
# @api private
# @return [Boolean]
def diffable?
!expected_is_a_literal_singleton?
end
private
def match(expected, actual)
actual.equal? expected
end
LITERAL_SINGLETONS = [true, false, nil]
def expected_is_a_literal_singleton?
LITERAL_SINGLETONS.include?(expected)
end
def actual_inspected
if LITERAL_SINGLETONS.include?(actual)
actual_formatted
else
inspect_object(actual)
end
end
def simple_failure_message
"\nexpected #{expected_formatted}\n got #{actual_inspected}\n"
end
def detailed_failure_message
<<-MESSAGE
expected #{inspect_object(expected)}
got #{inspect_object(actual)}
Compared using equal?, which compares object identity,
but expected and actual are not the same object. Use
`expect(actual).to eq(expected)` if you don't care about
object identity in this example.
MESSAGE
end
def inspect_object(o)
"#<#{o.class}:#{o.object_id}> => #{RSpec::Support::ObjectFormatter.format(o)}"
end
end
end
end
end
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